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Firefighters watch a back burn during the Mendocino Complex fire in Upper Lake, California on July 31, 2018. Dozens of fires have raged across the state since July 27, burning more than 200,000 acres of land, forcing thousands to evacuate and killing eight civilians and firefighters.

A Utah firefighter has died while battling the Mendocino Complex fire, officials said late Monday.

Authorities said the man died Monday night at a hospital after he was injured at the fire. An investigation is ongoing and notification of the next of kin is in progress. No other details have been released.

The Mendocino Complex fires, twin wildfires that are being fought as one, are together the largest wildfire in California's history.

The Ranch Fire has charred over 300,000 acres and is 59 percent contained. Cal Fire on Monday said the River Fire is now 100 percent contained and has burned nearly 49,000 acres.